Fan filter



FIG. 1 is a perspective view of a fan filter shown in use.

FIG. 2 is a front view.

FIG. 3 is a rear view; and,

FIG. 4 is a side view, the opposite side being a mirror image.

The broken line showing of environmental structure in FIG. 1 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a fan filter, as shown and described. 